SSI2 - Soil Salinity Index-2

SSI2Soil Salinity Index-2

Soil salinity index is a measure of the degree of salinity of soil, which is often expressed in terms of electrical conductivity (EC) or total dissolved salts (TDS) in the soil solution. It is an important parameter used to assess the potential for crop growth and soil fertility.

The Soil Salinity Index (SSI) is a standardized method for determining soil salinity based on measurements of electrical conductivity (EC) in soil extracts. The SSI is calculated by dividing the EC of a soil sample by the EC of a saturated soil extract, and then multiplying by 100. The resulting value is expressed as a percentage and is used to classify soils into different salinity categories, such as low, moderate, or high salinity.The SSI is a useful tool for evaluating the suitability of soils for agricultural or other land use purposes. High levels of soil salinity can affect plant growth, reduce soil fertility, and increase soil erosion.
By using the SSI to assess soil salinity levels, land managers can take appropriate measures to manage soil salinity and ensure that soil is used sustainably.
The spectral bands used to assess soil salinity are in the visible, near-infrared, and thermal-infrared regions of the electromagnetic spectrum. The most commonly used bands are the green, red, and near-infrared bands.Overall, remote sensing can be an effective tool to assess soil salinity levels over a large area, but the accuracy of the results depends on the spatial and spectral resolution of the platform used, as well as the accuracy of ground-based validation measurements. 

Formula:

Formula by Sentinel-2 bands 

References

• Douaoui and Lepinard (2010); Yahiaoui et al. (2015)